pop an empty stack

例句：

1. 1. The popcorn wasso good that I couldn't stopeating it.
   爆米花太好吃了，我忍不住一直吃。
2. 2. Shepopped the corkand poured the wine into aglass.
   她拔出木塞，把酒倒入玻璃杯中。
3. 3. Thepop song is still populartoday.
   这首流行歌曲至今仍然很受欢迎。